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Math Help - What does this (') mean in problem: (A U B)'??

  1. #1
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    What does this (') mean in problem: (A U B)'??

    whats that apostrophe thing for? help

    and here too: A' U B'???


    thanks
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  2. #2
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    (A U B)' is the complement of the set A U B ... the set of all elements not in
    A U B.

    A' U B' is the union of set A's complement and set B's complement.

    more info ...

    Complement Of A Set (with worked solutions)
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  3. #3
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    Quote Originally Posted by NeedHelp18 View Post
    whats that apostrophe thing for? help

    and here too: A' U B'???


    thanks
    hi
    it is very simple
    i will try to explain u by an example
    if Z = the set of numbers from 1,2,3.....10
    then A = the set of numbers, that is 2,6,10
    and B = the set of numbers, that is 1,3,5,9
    A' means the set of numbers which is not in A
    then A' = 1,3,4,5,7,8,9
    like that B' = 2,4,6,7,8,10
    then A' U B' is the set of all numbers in A' and B'
    that is A' U B' = the set of numbers that is 1,2,3,4,5,6,7,8,9,10.
    now u may understood that apostrophe denotes "not in the set"
    ok
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  4. #4
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    Quote Originally Posted by needhelp18 View Post
    whats that apostrophe thing for? Help

    and here too: A' u b'???


    Thanks
    P(\text{A}) = P(\text{A})

    P(\text{A}') = 1 - P(\text{A})
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